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You will find that all modeling tools employ a method to functionally decompose. ” The question is whether we have reached the most basic parts of this process or should we level further. Many analysts suggest that a fully decomposed DFD should have only one data flow input and one data flow output. Our diagram currently has many inputs and outputs and therefore it can be leveled further. 2. 2 Send Letter. The box surrounding the two processes within the Externals reflects them as components of the previous or parent level.

Both prototyping and RAD will be discussed in greater detail later. The most important part of implementing JAD is the management of the process and the determination of the appropriate individuals to be involved. The standard roles used in JAD are as follows: • • • • • • • executive sponsor: This individual effectively plays the same role as the executive supporter introduced earlier in this chapter. This person is typically at the vice-president level and ultimately has the responsibility for the business area.

Do not be afraid to ask why a person is not deemed necessary for the analysis of the system, and determine if you are satisfied with the reasons for their exclusion. Remember, you can still control and change the approach at this point, and management will probably respect you for doing so. Step 3: Assume the Situation Is Political Be sure you understand the personalities with which you will have to deal. In almost any implementation, politics among people becomes part of the process. To ignore its existence—and the constraints it is likely to impose—is to invite 3.